A friend of mine had one of the unsexiest muscle cars ever made... ...the AMC Gremlin X 304.
It had a 304 CID (5 liter) V-8 and a 3 speed floor shift. The car was so overpowered for the structure, and he drove it so hard, that the welded seams on the rear of the body started separating. The car was actually ripping itself apart by the time it was six years old.